Selective Carbon Dioxide Capture and Ultrahigh Iodine Uptake by Tetraphenylethylene-Functionalized Nitrogen-Rich Porous Organic Polymers

Abstract

The development of efficient adsorbent materials capable of dual capture of carbon dioxide (CO 2 ) and iodine is of great importance due to the significant contribution of anthropogenic CO 2 to climate change and the potential risks associated with nuclear energy sources, such as the release of radioactive iodine during nuclear waste processing and accidents. In this study, two nitrogen-rich tetraphenylethylene-functionalized porous organic polymers were prepared via a Schiff-base condensation reaction between 4,4′,4″,4‴-tetra(2,4-diamino-1,3,5-triazin-6-yl)tetraphenylethene (TTPE) and 2-carboxaldehydefuran or 2-carboxaldehydethiophene to form aminal-linked triazine-based porous organic polymers, TTPEPOP-O and TTPEPOP-S, having high surface areas of 741 and 999 m 2 g −1 , respectively. The synergetic effect of electron-rich nitrogen species, π-conjugated moieties, and microporosity of these polymers makes them promising adsorbents for effective CO 2 sequestration and iodine removal. TTPEPOP-O and TTPEPOP-S exhibit moderate CO 2 uptake of 2.34 and 2.94 mmol g −1 , respectively, at 273 K and 1.0 bar, with high selectivity to CO 2 over N 2 and CH 4 under ambient conditions. In addition, the two polymers demonstrate ultrahigh iodine uptake capacity of over 400 wt % from the gas phase and can remove up to 99% of dissolved iodine from iodine-cyclohexane solution. Based on our findings, the ecofriendly (metal-free) nature of TTPEPOPs and their ability to capture both CO 2 and iodine make them promising potential materials for environmental remediation.

Thermally Stable and High-Surface-Area Triptycene and Phenanthroline-Based Microporous Polymer for Selective CO2 Capture over CH4 and N2

“…Alternatively, the promising CO 2 capture capability TPPM can be further ascribed to the filling of abundant micropores as well as strong interactions between the quadrupole CO 2 molecule (Lewis acidic) and the polar N-centers (Lewis basic). The CO 2 molecules can efficiently interact with the polar nitrogen centers of TPPM through dipole–quadrupole interactions as well as Lewis acid–base interactions. , …”

Synthesis of Triazole-Linked Porous Cage Polymers: Modulating Cage Size for Tailored Iodine Adsorption

“…The research on iodine capture centers on developing high-performance adsorbent materials. − Various adsorbents, such as silver-based zeolites, activated carbons, metal–organic frameworks (MOFs), ,− covalent organic frameworks (COFs), − and porous organic polymers (POPs), − have been extensively studied for their potential use in iodine removal. In addition to these porous materials, porous organic cages (POCs) have recently been utilized as alternative adsorbents to capture iodine. ,− Compared to the extended polymeric materials, like MOFs, COFs, or POPs, that only have external pores, POCs comprise discrete organic cage molecules with intrinsic cavities and accessible windows.…”